TY - JOUR
T1 - Oxygen reduction reaction properties of vacuum-deposited Pt on thermally grown epitaxial graphene layers
AU - Watanabe, Masashi
AU - Kanauchi, Takafumi
AU - Chida, Yoshihiro
AU - Hayashi, Kenta
AU - Todoroki, Naoto
AU - Wadayama, Toshimasa
N1 - Funding Information:
This study was partly supported by the New Energy and Industrial Technology Development Program Organization (NEDO) of Japan. The authors also sincerely acknowledge K. Kusunoki (Nippon Steel Corporation) for kindly providing the SiC(0001) substrates and helpful discussions.
Publisher Copyright:
© 2022 Author(s).
PY - 2022/1/1
Y1 - 2022/1/1
N2 - We prepared platinum nanostructures on epitaxial graphene layers (EGLs) generated via the thermal annealing of SiC(0001) substrates [Pt/EGLs/SiC(0001)], and the oxygen reduction reaction (ORR) properties were investigated. 4H_ and 6H_SiC(0001) substrates were annealed at 1600 °C in a vacuum to generate EGLs through the sublimation of Si atoms from the Si-terminated SiC(0001) substrate surfaces. Subsequently, a 1.2 nm thick Pt layer was vacuum-deposited on the EGLs/SiC(0001) surfaces at 10-8 Pa to synthesize Pt/EGLs/SiC(0001) nanostructures. Furthermore, the Pt nanostructures were fabricated separately on a 500 eV hydrogen-ion-beam (H2+-beam) irradiated EGL/6H_SiC(0001) [Pt/H2+-EGLs/SiC(0001)]. The ORR properties of the three vacuum-synthesized Pt/EGLs/SiC(0001) samples were evaluated, and the Pt/H2+-EGLs/SiC(0001) surface revealed improved electrochemical structural stability, that is, enhanced ORR durability relative to the non-H2+-irradiated Pt/EGLs/SiC(0001) surfaces.
AB - We prepared platinum nanostructures on epitaxial graphene layers (EGLs) generated via the thermal annealing of SiC(0001) substrates [Pt/EGLs/SiC(0001)], and the oxygen reduction reaction (ORR) properties were investigated. 4H_ and 6H_SiC(0001) substrates were annealed at 1600 °C in a vacuum to generate EGLs through the sublimation of Si atoms from the Si-terminated SiC(0001) substrate surfaces. Subsequently, a 1.2 nm thick Pt layer was vacuum-deposited on the EGLs/SiC(0001) surfaces at 10-8 Pa to synthesize Pt/EGLs/SiC(0001) nanostructures. Furthermore, the Pt nanostructures were fabricated separately on a 500 eV hydrogen-ion-beam (H2+-beam) irradiated EGL/6H_SiC(0001) [Pt/H2+-EGLs/SiC(0001)]. The ORR properties of the three vacuum-synthesized Pt/EGLs/SiC(0001) samples were evaluated, and the Pt/H2+-EGLs/SiC(0001) surface revealed improved electrochemical structural stability, that is, enhanced ORR durability relative to the non-H2+-irradiated Pt/EGLs/SiC(0001) surfaces.
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U2 - 10.1116/6.0001379
DO - 10.1116/6.0001379
M3 - Article
AN - SCOPUS:85123010978
SN - 0734-2101
VL - 40
JO - Journal of Vacuum Science and Technology A
JF - Journal of Vacuum Science and Technology A
IS - 1
M1 - 013216
ER -